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| Study on Capacitor Voltage Balancing Control of Modular Multilevel Converters at Low Frequency |
| Liu Guowei, Jiang Qirong, Wei Yingdong |
| Tsinghua University Beijing 100084 China |
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Abstract This paper describes a control method and the operating performances of modular multilevel converter(MMC) for high-voltage motor drive. The magnitude of capacitor voltage ripples increases when operating frequency decreases. To deal with the significant voltage fluctuation under low frequency conditions, theoretical analysis is presented in this paper, and a new capacitor voltage balancing control strategy is proposed, which is based on carrier phase-shifted sinusoidal pulse width modulation(CPS-SPWM). The simulation results show that MMC works well and capacitor voltages are balanced with the control strategy at low frequency.
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Received: 19 September 2012
Published: 05 November 2014
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2014, Vol. 29 
